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HD 61827 – Spectral Analysis Astr 8600 Class Project Presentation. Paramita Barai 8 th Dec, 2003. Background. HD 61827 – Star in Cluster (NGC 2439) RA = 07h 39m 49.3s Dec = -32  34  42.1  B mag. = 8.11 V mag. = 7.66 Spectral Type: O8 / O9Ib (1997 A&A…323L..49P)

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Hd 61827 spectral analysis astr 8600 class project presentation

HD 61827 – Spectral AnalysisAstr 8600 Class Project Presentation

Paramita Barai

8th Dec, 2003


Background
Background

  • HD 61827 – Star in Cluster (NGC 2439)

  • RA = 07h 39m 49.3s

  • Dec = -32 34 42.1

  • B mag. = 8.11

  • V mag. = 7.66

  • Spectral Type:

    • O8 / O9Ib (1997 A&A…323L..49P)

    • B3 Ia (Turner, 1977 AJ…82..805T)

    • I think B3 supergiant

  • Parallax = 0.63 mas


Spectra observed
Spectra observed

  • KPNO Coude Feed Telescope

  • 2 observing runs :

    • Oct 2000 – 8 spectra

    • Dec 2000 – 17 spectra


Analysis spectral type
AnalysisSpectral Type

  • No HeII in absorption

  • Cooler than O supergiant

  • Strong carbon doublet absorption

  • B3 Supergiant


Single star with convective atmosphere
Single star with convective atmosphere

  • Spectral lines varied by small amount & randomly

  • H in emission – double peaked, randomly varying

  • Convective wind flow around star, atmospheric turbulence

  • Stellar absorption lines affected by the emission from gaseous envelope


Obs Times Abs Radial Centroid vel Eq width ISM

(t-2451000) Velocity of H-alpha of H-alpha line

(HJD, days) of star emisison emission velocity

817.99210 69.7607 -43.966999 0.111366 -0.264551

818.98270 68.9000 -98.056278 0.103513 0.358755

819.98540 66.3713 -2.7476891 0.193890 -0.798865

821.98710 66.0539 75.885895 0.509803 -1.67593

822.98540 68.5903 74.879163 0.579271 -1.49449

823.99210 73.2484 66.727690 0.665814 -0.413824

824.98560 83.2103 56.756792 0.777624 0.456484

831.00170 76.7857 70.034462 0.648179 -1.75772

889.92740 60.6403 176.53778 0.266625 -2.08747

890.94870 66.3107 164.15621 0.312579 -1.21548

893.92980 65.9936 163.25417 0.180265 -1.11643

894.90550 64.7917 146.39896 0.227874 -1.25792

895.97320 67.4618 121.18486 0.312627 -0.111312

896.89940 71.1799 96.059732 0.412994 0.254858

896.96770 71.9758 95.080074 0.431571 -0.906800

897.89470 67.6174 88.220027 0.386711 -1.05064

897.96250 67.0272 90.077823 0.393263 -0.834035

898.90690 66.4012 109.73705 0.307043 -1.22143

898.96910 66.8032 118.42820 0.297144 -0.566621

899.90060 65.2533 141.49436 0.270036 -1.88504

899.96300 64.0225 152.54472 0.224368 -1.82733

900.89390 65.7604 138.76702 0.413018 -0.250673

900.95610 65.7114 135.16257 0.437835 -0.237383

901.90210 75.3950 116.85906 0.432203 -0.0681385

901.96500 75.3741 111.83913 0.474489 0.00000


Results
Results

  • Single, B3 supergiant

  • Gaseous envelope around the star

    • Varied with ~ 5 days periodicity

  • More observations required to study the complex motions in the atmosphere accurately



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